A novel thin solid electrolyte film and its application in all-solid-state battery at room temperature
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A thin Li7La3Zr2O12 (LLZO) film of several micrometers was prepared by a novel method, which underwent the changes from micro-sized particles, nanoparticle slurry, and the final thin film. The LLZO film exhibited a high stability with metallic Li. The all-solid-state battery was composed by Li metal anode, a mixture cathode (LiCoO2 and LLZO), and the solid electrolyte of a composite of LLZO and LITFSI film. At room temperature, the Li/composite of LLZO and LITFSI/LCO cell showed a discharge capacity of 119.3 mAh g−1 at a current density of 0.21 mA cm−2 after 45 cycles, which was approximately 100% of that of the second cycle. Electrochemical impedance spectroscopy showed the reduction of the radius in low-frequency semicircle, demonstrating an improvement of interfacial contact between LLZO and LCO during the cycling.
KeywordsAll-solid-state batteries Lithium batteries Solid electrolytes Garnets Membranes
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